Key telephone set



FIGS. 1 and 2 are respectively front and rear elevational views of a key telephone set showing my new design;

FIGS. 3 and 4 are respectively top and bottom plan views thereof;

FIGS. 5 and 6 are respectively left and right side elevational views thereof; and

FIG. 7 is a perspective view thereof with handset shown inverted and spaced apart from the base. 

The ornamental design for a key telephone set, as shown and described. 